Using classic Outlook for Windows in business environments
Not on my OS X client. It is really easy to verify. You send an email from outlook.com/yahoo.com to your Gmail account, read it on your OS X Outlook mail client, and then go to Gmail webmail to verify it is shown as read. For myself, the only problem is with the new Outlook mail client on Windows.
To avoid the problem, I use the old Outlook mail client on Windows. It works correctly with all my other Outlook mail clients on Android, iOS, and OS X.